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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
         // 随机取到 x - y  之间的整数
       function get ( x , y){
           return parseInt(Math.random()*(y-x) +x)
       }

       console.log(get(5 ,90));
       
    </script>
</body>
</html>